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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 05-15-2012, 11:16 AM   #21
daniel_f.
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GM with 3,91:1

doesnīt look good in second?!
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Old 05-15-2012, 10:19 PM   #22
TerraPhantm
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GM with 3,91:1

doesnīt look good in second?!
If it could handle a 3.67:1 gear (1st gear in the ZF) I don't see why it would have trouble tolerating a 2.2:1 gear.
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Old 05-16-2012, 12:58 AM   #23
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well, i donīt think its about handling torque. i just donīt like the fact that the second to third change is at ~86km/h
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Old 05-16-2012, 02:42 AM   #24
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well, i donīt think its about handling torque. i just donīt like the fact that the second to third change is at ~86km/h
Oh never mind, I thought you were saying the one transmission would need the 188 diff more than the other.

Almost every (US) E46 has a GM transmission anyway. I don't think I'd really care what the redline speeds are if I'm not doing the shifting myself anyway.
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Old 05-18-2012, 03:08 AM   #25
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I have an auto 01 330ci with the ZF tyranny. I want shorter gearing also. Would the 3.64 or 3.91 swap be a direct swap?

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Old 05-19-2012, 07:47 AM   #26
daniel_f.
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I have an auto 01 330ci with the ZF tyranny. I want shorter gearing also. Would the 3.64 or 3.91 swap be a direct swap?

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You need a 188k with big (6 screws) pinion input flange. can be found at the 2.5L E83 M54B25 with MANUAL transmission.

you could also use a 3.91 diff from a M54B20 E46 with "Antriebsauslegung Export", but this one is only 168k (designed for less torque) and all 3 flanges must be changed. the problem in changing the input flange is, there is no statement how much torque the pinion nut must have. So you have to count the revolutions the nut is torqued down and use the same revolutions with the new input flange from your old diff.

and at the end of the day, youīll have something like this

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Old 05-19-2012, 11:42 AM   #27
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You need a 188k with big (6 screws) pinion input flange. can be found at the 2.5L E83 M54B25 with MANUAL transmission.

you could also use a 3.91 diff from a M54B20 E46 with "Antriebsauslegung Export", but this one is only 168k (designed for less torque) and all 3 flanges must be changed. the problem in changing the input flange is, there is no statement how much torque the pinion nut must have. So you have to count the revolutions the nut is torqued down and use the same revolutions with the new input flange from your old diff.

and at the end of the day, youīll have something like this

Is this a 3.64 or a 3.91? I would prefer the 3.91 if I'm going to do it but if the 3.64 is stronger and an easier of a swap, that is what I want. I want to be able to just unbolt my differential and bolt the new one on and start driving.
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Old 05-21-2012, 08:23 AM   #28
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So, you want a 3,64 from a ZHP.
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Old 05-21-2012, 11:24 AM   #29
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Thanks Daniel! :thumbs: that is going to be my next project as soon as I can source a diff from a ZHP. Are both manual and auto ZHP diff's the same? I'm assuming I will need/want a diff from an auto
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Old 05-21-2012, 11:33 AM   #30
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Thanks Daniel! :thumbs: that is going to be my next project as soon as I can source a diff from a ZHP. Are both manual and auto ZHP diff's the same? I'm assuming I will need/want a diff from an auto
hit up a euro junk yard
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Old 05-21-2012, 12:03 PM   #31
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Thanks Daniel! :thumbs: that is going to be my next project as soon as I can source a diff from a ZHP. Are both manual and auto ZHP diff's the same? I'm assuming I will need/want a diff from an auto
You'll definitely want to source from an auto. Manual transmission cars came with a 3.07 diff ratio.
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Old 05-23-2012, 11:37 AM   #32
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I just destroyed my 3.64 ZHP diff 3 days after tranny swap
Went from Auto to Manual 6 speed with UUC lwf & clutch ... Diff was 93k miles only and it failed, one tooth broke

So I installed 3.07 from other ZHP (which is haaaard to find in Russia). Acceleration feels slower, but 0-100 km/h (0-62 mph) time is better as there's no extrashift onto 3rd gear at 80 km/h

We got lots of 3.38 diffs in Russia, will this be a better option for a Manual rather than 3.07?

Last edited by Karabogazgol; 05-23-2012 at 11:49 AM.
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Old 05-23-2012, 11:56 AM   #33
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How'd you manage to destroy your 3.64?
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Old 05-23-2012, 11:49 PM   #34
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I just destroyed my 3.64 ZHP diff 3 days after tranny swap
Went from Auto to Manual 6 speed with UUC lwf & clutch ... Diff was 93k miles only and it failed, one tooth broke

So I installed 3.07 from other ZHP (which is haaaard to find in Russia). Acceleration feels slower, but 0-100 km/h (0-62 mph) time is better as there's no extrashift onto 3rd gear at 80 km/h

We got lots of 3.38 diffs in Russia, will this be a better option for a Manual rather than 3.07?
Depends on what you want... 3.38 will get you better acceleration but it will lower your top speed. You will also get a little better gas mileage in the city. The 3.07 will give you a higher top speed, but lower acceleration, and a little better highway mileage.
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Old 05-24-2012, 05:25 AM   #35
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How'd you manage to destroy your 3.64?
Suspect that bad diff oil caused it.
Never been changed and when we opened the diff the oil was totally black with ant smell in it

Shoot on the Moscow ring highway about 50 km run on high RPMs and after that heard the clinking sound somewhere in the rear.
Went straight to my mechanic who said that apparently one or two teeth are broken in the diff...

The guess was that old oil overheated causing parts to brake Even though I have Performance diff cover (33117512980) installed.
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Old 05-24-2012, 08:34 AM   #36
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Suspect that bad diff oil caused it.
Never been changed and when we opened the diff the oil was totally black with ant smell in it .
That is a bummer. Sorry to hear.
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Old 05-24-2012, 10:17 AM   #37
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TxZHP04
BTW how 3.64 feels with ESS TS2+? 1 & 2 gears must be really short with 350+ hp
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Old 05-24-2012, 05:09 PM   #38
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TxZHP04
BTW how 3.64 feels with ESS TS2+? 1 & 2 gears must be really short with 350+ hp
First is a little short but it's still manageable. Took a day or 2 for me to quit bouncing off the limiter after upgrading from the 3.23. I thought it might have been too short for me but I actually love it, turned out to be the perfect finishing touch to my car.
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Old 06-19-2012, 06:32 AM   #39
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got it fitted last weekend and it makes a huge differnce compared to stock 3.38:1

iīm using it with z4 tranny software and the modification to lock converter at 60km/h. it shifts stiffer, much faster and the engine sounds much more like a SMG then auto transmission.

definately worth to swap one of the best things one can do to his ZF tranny

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Old 07-09-2012, 09:18 PM   #40
NaZty NaZe One!
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hahah finally! picked up a 3.64 with a finned cover. will be doing the swap soon. does it make a difference if it came from a z4 or a zhp?
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